Fix external issue trackers redirect

Closes #35132

See merge request !12923

Free `system` namespace by moving uploads into `uploads/-`

Closes #33550

See merge request !12917

Update Prometheus gem to version that explicitly calls `munmap`

See merge request !12955

Remove developer documentation about not describing symbols

See merge request !12953

Provide option to trigger package build only for official CE and EE repos in .com

See merge request !12949

Bump peek-performance_bar to 1.3.0 and get rid of a monkey-patch

See merge request !12939

Gitaly commits between

Closes gitaly#350

See merge request !12669

Add structured logging for Rails processes

See merge request !12928

Rename Project nav items

Closes #34764

See merge request !12921

Remove transitions on nav link hover

Closes #35210

See merge request !12950

Fix download artifacts button alignment

Closes #35137

See merge request !12942

Simplify width for dropdown-menu on mobile

Closes #34468 and #35226

See merge request !12528

[ci skip]

Update avatar border to be opaque for better stacking -- EE backport

Closes #32561

See merge request !12940

This is now covered by rubocop-rspec.

35087 Fix alignment of controls in mr issuable list

Closes #35087

See merge request !12890

Disable Rails logging in CI test environments

See merge request !12847

Fix queries duration sorting in Performance Bar

Closes #35252

See merge request !12947

Update Prometheus documentation for 9.4

Closes #35129

See merge request !12885

Update Prometheus admin documentation for 9.4 - docs

Closes #35175

See merge request !12903

Signed-off-by: Rémy Coutable <remy@rymai.me>

This introduces JSON logging for Rails views saved to a file called
`development_json.log`, `production_json.log`, etc.

For example, instead of this unparsable log:

```
Started GET "/" for 127.0.0.1 at 2012-03-10 14:28:14 +0100
Processing by HomeController#index as HTML
  Rendered text template within layouts/application (0.0ms)
  Rendered layouts/_assets.html.erb (2.0ms)
  Rendered layouts/_top.html.erb (2.6ms)
  Rendered layouts/_about.html.erb (0.3ms)
  Rendered layouts/_google_analytics.html.erb (0.4ms)
Completed 200 OK in 79ms (Views: 78.8ms | ActiveRecord: 0.0ms)
```

We get a single line with this:

```
{"method":"GET","path":"/,"format":"html","controller":"HomeController","action":"index","status":200,"duration":79,"view":78.8,"db":0.0,"location":"http://localhost/","time":"2017-07-18 09:35:17 -0700"}
```

Part of #20060

See https://jtway.co/speed-up-your-rails-test-suite-by-6-in-1-line-13fedb869ec4

Update Gitaly Server Version to 0.21.2

See merge request !12937

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/32561